RCT in Ireland: What Happens If You Miss a Notification (and How to Avoid Penalties)

If you run a construction business, managing RCT in Ireland often feels like a full-time job. Between VAT, payroll, and RCT, the admin side can quickly become overwhelming.

For many contractors, the biggest challenge is handling RCT notifications. On paper, it looks simple: before you pay a subcontractor, you notify Revenue. Revenue then tells you the correct RCT rate, and you deduct it if required.

But in reality, when you’re managing sites, invoices, and deadlines, it’s easy to miss a step. Forgetting to file an RCT in Ireland payment notification before paying a subcontractor can be costly. Revenue takes it seriously, and penalties can quickly add up.

This guide explains why RCT notifications matter, what happens if you miss one, and how to avoid penalties.

Why RCT Notifications Matter

RCT is a withholding tax that ensures subcontractors pay the correct tax. The rules apply to construction, forestry, and meat processing. For most readers here, it’s about building work.

As the principal contractor, you are responsible for handling RCT. Every time you pay a subcontractor, you must log into ROS and submit a payment notification. Revenue then issues a Deduction Authorisation, which confirms the correct RCT rate: 0%, 20%, or 35%.

It doesn’t matter if:

• It’s the same subcontractor you’ve worked with for years
• You already notified the contract at the start
• The payment is small or for a quick job

You still have to notify every payment in advance. If you pay first and think you’ll sort the paperwork later, Revenue counts it as an unreported payment. That’s when penalties start.

If you also handle VAT for subcontractors or mixed supply construction work, our guide on VAT rates can help you avoid further compliance issues: VAT Rate on Construction Services in Ireland: 13.5% and When It Applies

What Happens If You Miss an RCT Notification

When you skip a notification, Revenue flags the payment as unreported. That means penalties.

The consequences may include:

• A penalty percentage of the payment, from 3% to 35% depending on the subcontractor’s tax status
• Covering the RCT tax yourself if you didn’t deduct it at source
• Losing the expense deduction, meaning Revenue won’t allow the payment as a cost in your accounts
• Interest charges on late tax payments

One forgotten notification can turn a profitable job into a loss.

The RCT Penalty System

Revenue’s penalty rates depend on the subcontractor’s compliance record:

• 0% rate subcontractor (fully compliant): Penalty = 3% of payment
• 20% rate subcontractor (standard): Penalty = 10% of payment
• 35% rate subcontractor (non-compliant): Penalty = 20% of payment
• Unregistered subcontractor: Penalty = 35% of payment

These penalties come on top of any RCT you should have withheld.

A Real-World Example

Imagine you pay a subcontractor €10,000 but forget to notify Revenue.

If they are on the 20% rate, Revenue applies a 10% penalty. That’s €1,000.
You may also have to pay the €2,000 RCT that should have been withheld.

Total cost: €3,000.

That’s 30% of the invoice gone because of one missed click in ROS. For larger contracts, penalties like this can wipe out profits fast.

Common Pitfalls for Contractors

From experience, here are the most common mistakes:

• Thinking one notification covers multiple payments → It doesn’t.
• Paying first and filing later → Late notifications are still non-compliant.
• Assuming a 0% rate means no notification → Even if no tax is withheld, you must still notify.
• Site managers paying subcontractors directly → If accounts never see the payment, the notification can be missed.

For more construction-related VAT mistakes, see our guide on the Two-Thirds Rule here: Understanding the Two-Thirds Rule for VAT in Construction

How to Avoid RCT Penalties

The good news: RCT doesn’t have to be complicated if you make it part of your process.

• No notification, no payment. Make this a strict rule in your business.
• Build it into your workflow. Only release subcontractor payments after ROS confirms the notification.
• Set reminders. Weekly or monthly checks help prevent mistakes.
• Train your team. Everyone involved in payments should understand the rules.
• Act quickly if you miss one. File the notification as soon as you notice. Revenue is often more lenient if you fix errors promptly.

Final Thoughts

Running a construction business is demanding, and admin often feels like a distraction. But ignoring RCT, even once, can be expensive.

RCT penalties are not designed to trip you up, but they are strict if you cut corners. The easiest way to protect your profits is to make RCT payment notifications a non-negotiable part of your payment process.

That way, you stay compliant, protect your margins, and keep Revenue off your back.

Need Help With RCT Compliance or Avoiding Penalties?

We regularly assist contractors and construction businesses with RCT notifications, resolving penalties, and staying compliant with Revenue requirements.
Our goal is to make sure your projects run smoothly and that avoidable fines never affect your margins.

Contact Richard OShea Consultancy today for support with RCT, VAT, subcontractor compliance, or any Irish construction tax queries. Contact Us.

This article is intended for informational purposes only and should not be considered a replacement for professional advice. The author(s) disclaim any liability for actions taken or not taken based on the content of this document. It is recommended to seek tailored advice before making any decisions related to the topics discussed in this article.